package Text_23;

import java.util.Random;

public class Code {

	public static void main(String[] args) {
		Random r = new Random();
        char[] ch = new char[52];
        for (int i = 0; i < ch.length; i++) {
            if(i<=25){
                ch[i] = (char)(97+i);
            }else {
                ch[i] = (char)(65+i-26);
            }

        }
        String re = "";

        for (int j = 0; j <4 ; j++) {
            int a = r.nextInt(ch.length);
            re = re+ch[a] ;
        }
        int i = r.nextInt(10);
        re = re + i;
        System.out.print(re+" ");

	}

}
